JP2012213337A - Absorptive sheet for bed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an absorptive sheet for a bed which can improve liquid diffusibilty in a direction parallel with a sheet face by preventing the diffusion of the absorption in the width direction without changing a material of an absorption body.SOLUTION: The absorptive sheet for the bed has a liquid permeable surface sheet, a liquid non-permeable surface sheet, and the absorption body interposed between the sheets, and also has a normal-pressure absorption amount per 1 cmnot smaller than 0.2 cc. The absorption body has a thickness-expansion preventing processing part which suppresses liquid passing through the surface sheet to 7 mm or smaller in the expansion of the width direction when absorbed by 30 cc. The expansion of the thickness is suppressed by improving the liquid diffusion in a direction parallel with the absorptive sheet for the bed by embossing processing. The expansion of the absorption body is prevented by adhesion. The adhesion is performed by hot melting or the embossing processing.

Description

  The present invention relates to an absorbent sheet for pets.

  In recent years, the market for indoor dogs has expanded, and absorbent sheets for pets for absorbing urine excreted by pets such as dogs and cats have become widespread. In particular, since the number of breeders who are absent during the day tends to increase, a thick-type absorbent sheet for pets, which can handle multiple urinations, is required. As such a pet absorbent sheet, a configuration including a liquid-permeable top sheet, a liquid-impervious back sheet, and an absorbent body interposed between the top sheet and the back sheet is known. Yes.

In addition, there is a use form in which a pet absorbent sheet is laid on a pet sheet tray and a mesh-like (lattice-like) lid is placed thereon to counter the reversal from the pet absorbent sheet. When the absorption diffusion during urination spreads in the height (thickness) direction of the pet absorbent sheet, the pet absorbent sheet swells to the mesh-like lid on the upper surface, and the surface of the pet absorbent sheet is the mesh of the tray There is a problem in that liquid contact or overflow occurs due to contact with the lid, which causes absorption inhibition. In that state, urine adheres to the pet's feet, and if the person walks in the room, the room gets dirty.
Therefore, for example, the absorber is made up of two layers, an upper layer and a lower layer, and the absorption rate of the lower layer is increased compared to the upper layer, or a diffusive sheet is arranged between the upper layer and the lower layer, thereby improving the diffusibility of urine. An absorbent sheet for pets is known (Patent Document 1).

JP 2009-232684 A

  However, although the absorbent sheet for pets of Patent Document 1 brings about an improvement in diffusibility, it does not directly prevent expansion in the thickness direction, so it can be said that it is certain in preventing the occurrence of liquid pool and overflow. Absent. Moreover, the constituent material of the absorber is increased, leading to an increase in manufacturing cost.

  The object of the present invention is to improve the liquid diffusibility in the direction parallel to the sheet surface by suppressing the expansion of the absorber in the thickness direction (preventing the expansion of the thickness) without changing the material of the absorber. It is an object of the present invention to provide an absorbent sheet for pets that can be used without impairing the original functions of the tray with a lid, such as prevention of reversal, even when the lid of the tray is used.

In order to solve the above-mentioned problem, the invention according to claim 1
A liquid-permeable top sheet, a liquid-impervious back sheet, and an absorbent body interposed between the top sheet and the back sheet, the normal pressure absorption per square centimeter being 0 In the absorbent sheet for pets of 2cc or more,
The absorbent body has a thickness expansion preventing processing portion that suppresses expansion in the thickness direction when absorbing 30 cc of physiological saline that has passed through the top sheet to 7 mm or less.

According to the first aspect of the present invention, since the thickness expansion preventing portion is provided on the substantially entire surface of the absorbent body, expansion in the thickness direction can be suppressed.
Therefore, since it does not contact the mesh-shaped lid of the tray, it is possible to prevent liquid accumulation and overflow when the tray is used. As a result, it is possible to prevent the pet's foot from becoming dirty with urine during urination. Therefore, even if the pet walks indoors after urination, the room is not soiled.

  The invention according to claim 2 is that, in the pet absorbent sheet according to claim 1, the thickness expansion prevention processed portion is an embossed portion subjected to embossing to suppress expansion in the thickness direction. Features.

According to the invention described in claim 2, it is needless to say that the same effect as that of the invention described in claim 1 can be obtained, production by an existing production line is possible, and the thickness expansion can be prevented by changing the mold. It has the merit that the pattern and design of the processed part can be changed.
Moreover, since the rigidity of the whole pet absorbent sheet can be increased, there is an effect that even if a pet is placed on the pet absorbent sheet, it is less likely to become wrinkles.

  Invention of Claim 3 is the absorbent sheet for pets as described in any one of Claim 1 or 2, WHEREIN: The said thickness expansion prevention process part is arbitrary 10 centimeters diameter in the said absorbent sheet for pets. At least one is provided in the circle.

  According to the invention described in claim 3, it is needless to say that the same effect as that of the invention described in claim 1 or 2 can be obtained, and since the surface sheet does not float from the absorbent body, expansion in the thickness direction can be prevented. Thereby, the prevention of liquid accumulation when using the tray can be expected more greatly.

According to the present invention, since the thickness expansion preventing processing portion is provided on substantially the entire surface of the absorbent body, expansion in the thickness direction can be suppressed.
Moreover, since only one type of material is required for the absorber, there is a cost advantage.
When using the tray, it can prevent liquid accumulation and overflow. As a result, it is possible to prevent the pet's foot from becoming dirty with urine during urination. Therefore, even if the pet walks indoors after urination, the room is not soiled.

They are sectional drawing (Drawing 1 (a)) and a top view (Drawing 1 (b)) showing typically an example of an absorptive sheet for pets of a 1st embodiment. It is the top view which looked at the tray for pet sheets with a mesh-shaped cover from right above. It is a figure explaining a mode that a liquid is absorbed in the case of use of an absorptive sheet for pets. It is a figure explaining the modification of an embossing part.

Hereinafter, the pet absorbent sheet according to an embodiment of the present invention will be described in detail with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.
In the following description, the longitudinal direction of the pet absorbent sheet is the X direction, and the direction (width direction) orthogonal to the X direction is the Y direction. Moreover, let the thickness direction of the absorbent sheet for pets be a Z direction.

(First embodiment)
The pet absorbent sheet according to the first embodiment of the present invention will be described with reference to FIGS. 1, 2, and 3.
For example, as shown in FIG. 1, the pet absorbent sheet 100 has a rectangular shape in plan view. For example, the pet absorbent sheet 100 is laid on the inside of the pet sheet tray 200 depicted in FIG. 210 is used, and the moisture in excretion excreted by the pet through the surface sheet can be absorbed by the absorbent body in the sheet.

  Specifically, as shown in FIG. 1, the pet absorbent sheet 100 is disposed on a liquid-permeable top sheet (surface sheet) 101 that allows liquid such as urine to permeate quickly, and on the back surface side of the top sheet 101. A liquid-impermeable back sheet (back sheet) 107 and an absorbent body 105 interposed between the top sheet (front sheet) 101 and the back sheet (back sheet) 107. .

The top sheet 101 is formed of a perforated or non-porous nonwoven fabric, a porous plastic sheet, or the like. As the raw material fibers constituting the nonwoven fabric, synthetic fibers such as polyethylene or polypropylene such as olefin, polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used. In addition, as a method for producing the nonwoven fabric, a known method can be appropriately used. Can be manufactured.
When a large number of through-holes are formed in the top sheet 101, liquid such as urine is absorbed more quickly, and the dry touch property is excellent.

The back sheet 107 covers the bottom surface of the absorbent body 105, further covers the end face of the absorbent body 105, and is folded back toward the top sheet 101 at both longitudinal side edges of the top surface of the absorbent body 105. The folded portion of the back sheet 107 and the top sheet 101 are bonded by a hot melt adhesive, heat seal, ultrasonic seal or the like.
The back sheet 107 is not particularly limited as long as it is a liquid-impermeable material. For example, a plastic film made of an olefin resin such as polyethylene or polypropylene, or a plastic film is provided on the surface of the nonwoven fabric. Examples thereof include a laminated nonwoven fabric and a laminated sheet obtained by laminating a nonwoven fabric on a plastic film. In addition, non-woven fabric using micro-denier fiber, enhanced leakage prevention by reducing fiber voids by applying heat or pressure, coating with superabsorbent resin or hydrophobic resin or water repellent Thus, a sheet that is liquid-impermeable without using a plastic film can also be used as the back sheet 107.

The absorber 105 absorbs water-like components such as urine, and can be formed of, for example, an aggregate of fibers. As this fiber assembly, a filament assembly obtained by opening, as necessary, synthetic fiber tows (fiber bundles) such as cellulose acetate as well as short fibers such as cotton-like pulp and synthetic fibers Can also be used. In addition, the absorbent body 105 can be configured by combining a fiber assembly with a super absorbent polymer (SAP; Super Absorbent Polymer, hereinafter abbreviated as “SAP”).
Examples of the superabsorbent resin include carboxymethylcellulose, polyacrylic acid and salts thereof, acrylate polymer cross-linked product, starch-acrylic acid graft copolymer, starch-acrylonitrile graft copolymer hydrolyzate, polyoxyethylene cross-linked product Products, crosslinked products of water-swellable polymers such as polyethylene oxide and polyacrylamide, or copolymers of isobutylene and maleic acid are preferably used.
Further, a deodorant may be added to the absorber 105 in order to have a deodorizing function. As the deodorant, for example, activated carbon, natural minerals (for example, bennite, kaolinite, kanemite, etc.), synthetic inorganic substances (zeolite, amorphous silica, etc.) can be used.

  The absorbent body 105 in the first embodiment is composed of pulp (virgin fluff pulp) and a superabsorbent polymer as main components and is formed into a film shape, and is covered with the upper crepe paper 103 on the upper side (surface sheet side). The lower crepe paper 104 is covered on the lower side (back sheet side). The top spiral 102 is an adhesive portion made of a hot melt adhesive, and adheres the absorber 105 to the top sheet (surface sheet) 101 via the upper crepe paper 103. The hot melt is spirally applied to the inner side (absorber side) of the top sheet (surface sheet) as shown by the broken line 110 in FIG. 1B, and adhesion over a wide area is performed with a small amount of adhesive. It adheres in a sparse state that does not impair the liquid permeability of the sheet. As a result of being applied in the form of a mist, the top spiral 102 spreads over the entire absorber side of the top sheet 101, so that it is depicted as being applied to the entire top sheet in FIG. On the other hand, the locus of movement of the nozzle for applying the hot melt when applying the spiral is a spiral shape drawn by a broken line 110 in FIG.

  An embossed portion 120 is provided over substantially the entire area of the absorber. In the first embodiment, the embossing part 120 has a lattice-like pattern having an inclination of 45 degrees with respect to the outline of the pet absorbent sheet 100, and the absorbent body 105 is an upper crepe paper. Embossing is performed while being sandwiched between 103 and the lower crepe paper 104. The embossed portion 120 is provided as a concave portion formed in a lattice shape over substantially the entire area of the absorbent body of the pet absorbent sheet, that is, as a linear groove portion. In the first embodiment, the upper crepe paper 103, the absorber 105, and the lower crepe paper 104 are stacked in order from the top in the Z direction to perform embossing that presses an embossing roll. As the embossing, heat embossing using a heated embossing roll is preferable from the viewpoint of adhesion between the upper crepe paper 103, the absorber 105, and the lower crepe paper 104.

  In this case, a recess by embossing is formed on the upper crepe paper 103, and a recess by embossing is formed so as to reach a part of the absorber 105 in the thickness direction or substantially the whole. For example, the horizontal diffusion speed of the liquid can be adjusted by alternately applying embossing of high pressure and low pressure. The recess formed by the embossing has an effect of inducing and diffusing the liquid in the extending direction, so that a wider part of the absorber 105 can be used for absorption. Therefore, even when urine is concentrated in one place. Leakage due to insufficient absorption capacity is less likely to occur.

  A back bead 106 provided on the inner side (absorber 105 side) of the back sheet (back sheet) 107 is an adhesive that adheres the back sheet (back sheet) 107 and the absorber 105. Specifically, a back bead is provided by applying a hot melt adhesive in a straight line.

(Example)

  Table 1 shows the material of each member in the example. In the present embodiment, virgin pulp was used as the pulp constituting the absorber, but waste paper pulp can also be used. An acrylic acid polymer was used as the superabsorbent polymer constituting the absorber. A porous plastic sheet was used as the top sheet (surface sheet). As the back sheet, a non-breathable polyethylene film was used. As the hot melt, a base polymer SIS / SBS was used.

  Table 2 shows the dimensions of each member in the example. In Table 2, MD means the length in the machine direction (the direction in which the production line flows). CD indicates a direction orthogonal to MD.

  Table 3 shows the specifications of the absorbent sheet for pets of the examples. “Normal pressure absorption” is 0.9% saline when 0.9% physiological saline is soaked for 5 minutes with the top sheet facing the surface of the water, and then drained for 2 minutes 30 seconds. It is an amount indicating whether or not to absorb. “Product thickness” is a value obtained by measuring the thickness of the absorber 105 in an unweighted state. The “height after absorption” is a value obtained by absorbing 30 cc of 0.9% physiological saline and measuring the height after one minute without load. Tray 1 and tray 2 are selected from two types of commercially available pet sheet trays, each of which is numbered. In Comparative Example 1 and Comparative Example 2, two types of commercially available pet sheets are selected and named. The column of an Example is the absorptive sheet for pets of 1st Embodiment concerning this invention, Comprising: The thing of the specification of Table 1 and Table 2 is shown.

An experimental method for obtaining the experimental data in Table 3 will be described. The tray 1 and the tray 2 are each composed of a pet sheet tray 200 shaped like a square tray as depicted in FIG. 2 and a mesh-like (lattice-like) lid 210. The pet absorbent sheet 100 is laid and used. As shown in Table 3, the pet absorbent sheets of Examples, Comparative Example 1 and Comparative Example 2 have the same size and can accommodate both tray 1 and tray 2. Then, these three kinds of pet absorbent sheet, Example As can be seen from the section of atmospheric pressure suction yield per unit area of the table 3 is 0.4492cc / cm ^2, the conventional product A is 0.3801cc / cm ² The conventional product B is 0.3708 cc / cm ^2, and both are absorbent sheets for pets with a total absorption per square centimeter of 0.2 cc or more.

  As shown in FIG. 3, these pet absorbent sheets are laid on the tray 1 and the tray 2 (200), respectively, and a mesh-like lid 210 is placed thereon. Slowly drip 30 cc of physiological saline from a fixed place at a predetermined height (specifically, a height of 5 cm). Specifically, physiological saline is hung by natural fall using a Terumo syringe 50 ml (ss-50ESz). The thickness of the absorber was measured after the lapse of 1 minute after the suspension. Table 3 shows the results obtained by taking this measurement for each of the three types of absorbent sheets for pets, arbitrarily taking out five products and repeating the measurement five times. In the examples, the average was 6.6 mm. On the other hand, in Comparative Example 1, it was 12.8 mm, and in Comparative Example 2, it was 9.6 mm.

  As shown in the section on evaluation of tray use in Table 3, in the examples (examples of the first embodiment), when used for the tray 1 or the tray 2, a liquid pool is generated when 30 cc is urinated. There was not (FIG.3 (c)). On the other hand, in Comparative Example 1 and Comparative Example 2, in both the tray 1 and the tray 2, a liquid pool was generated during 30 cc urination (FIG. 3B). Fig.3 (a) is sectional drawing which shows a mode that physiological saline is dripped. FIG. 3B is an enlarged cross-sectional view showing a state in which swelling occurs during absorption and the top sheet and the tray lid are in contact with each other. FIG.3 (c) is an expanded sectional view which shows the state which does not swell at the time of absorption and has a clearance gap between a top sheet and a tray cover after absorption. Here, when the liquid absorbent is not fully absorbed by the pet absorbent sheet and the mesh lid of the tray is viewed from above, the urine overflows on the pet absorbent sheet. This is a state that can be recognized.

Here, the relationship between the description of the means for solving the above-described invention and the embodiments will be clarified. First, all of Examples, Comparative Example 1 and Comparative Example 2 are “a liquid-permeable top sheet, a liquid-impervious back sheet, and an absorber interposed between the top sheet and the back sheet. And the total absorbed amount per square centimeter is 0.2 cc or more.
And in the examples, it is clear from the experimental results shown in Table 3 that "the absorber suppressed the expansion in the thickness direction when absorbing 30 cc of physiological saline that permeated the top sheet to 7 mm or less". became. And the structure which brought about this result is the embossing given to the absorber. Therefore, the “embossing applied to the absorber” portion corresponds to the thickness expansion prevention processing portion.

Moreover, since the rigidity can be increased by forming a concave portion by embossing in the absorbent body 105, the absorbent body 105 is stiff due to the concave portion, and the pet absorbent sheet can be worn even if the pet rides on the pet absorbent sheet. There is an effect that it is difficult to become.
When using the tray, it can prevent liquid accumulation and overflow. As a result, it is possible to prevent the pet's foot from becoming dirty with urine during urination. Therefore, even if the pet walks indoors after urination, the room is not soiled.

(Second Embodiment)
Next, the pet absorbent sheet of the second embodiment will be described.

The pet absorbent sheet of the second embodiment is different from the first embodiment in that embossing is performed in a state where the top sheet and the absorbent body are laminated. In 1st Embodiment, the embossing was given to the absorber 105 and adhesion | attachment with an absorber and a surface sheet was based on hot melt.
That is, in the first embodiment, the target of embossing is the absorber 105 (strictly speaking, the state in which the upper crepe paper 103, the absorber 105, and the lower crepe paper 104 are laminated). On the other hand, in 2nd Embodiment, embossing is given in the state which accumulated the surface sheet 101 on the absorber 105 (103,105,104). Thereby, the adhesion degree of a surface sheet (top sheet) and an absorber increases, and the swelling of the thickness direction at the time of absorption can be suppressed by eliminating the swelling of a top sheet.

  According to the absorbent sheet 2 for pets of 2nd Embodiment demonstrated above, it will be in the state by which the top sheet was stretched by embossing in the state which accumulated the top sheet and the absorber, and the thickness of an absorber by the tension | tensile_strength This brings about the effect that expansion is suppressed.

(Modification 1 of embossed part)
Next, in the pet absorbent sheet according to the first embodiment and the second embodiment, Modification 1 of the embossed portion 120 is shown in FIG.
In the description of Modification 1, the same components as those in the first embodiment or the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The embossed part 130 of the first modification has a shape (dot pattern) in which dot-like recesses are scattered over substantially the entire area of the absorber 105. According to the pet absorbent sheet 3 provided with the embossed portion 130, liquid such as urine can be diffused over the entire surface of the absorbent body 14 along the edge of the recess, and expansion in the thickness direction can be prevented. In the thick pet sheet of the size shown in Table 3, when it is considered that three urinations are absorbed, the diameter of one urination is 10 centimeters or less. Therefore, it is thought that it is necessary to provide at least one fulcrum (thickness expansion prevention processing portion) in any 10 centimeter diameter circle in the pet sheet. The dot pattern shown in FIG. 4A is designed to satisfy the condition.

  In addition, this invention is not limited to the said 1st, 2nd embodiment and the modifications 1 and 2, Of course, it can change suitably about a specific structure.

100 PET Absorbent Sheet 101 Top Sheet (Top Sheet)
102 Top spiral (adhesion part: expansion prevention processing part)
103 Upper Crepe Paper 104 Lower Crepe Paper 105 Absorber 106 Back Bead 107 Back Sheet (Back Sheet)
110 Top spiral (trajectory of nozzle for applying hot melt)
120 Embossed part (Expansion prevention part)
130 Embossed part (Expansion prevention part)
140 Embossed part (Expansion prevention part)
200 Pet sheet tray 210 Mesh lid

Claims (3)

A liquid-permeable top sheet, a liquid-impervious back sheet, and an absorbent body interposed between the top sheet and the back sheet, the normal pressure absorption per square centimeter being 0 In the absorbent sheet for pets of 2cc or more,
The absorbent sheet for pets according to claim 1, wherein the absorbent body has a thickness expansion prevention processing portion that suppresses expansion in a thickness direction to 7 mm or less when 30 cc of physiological saline that has permeated the top sheet is absorbed.   The absorbent sheet for pets according to claim 1, wherein the thickness expansion prevention processed portion is an embossed portion subjected to embossing.   The said thickness expansion prevention process part is provided in at least 1 in the arbitrary 10 centimeter diameter circles in the said absorbent sheet for pets, It is for pets as described in any one of Claim 1 or 2 characterized by the above-mentioned. Absorbent sheet.

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